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Slanje poruka sa kvantnim potpisom

Jakša Tomović

Published Sep 22, 2017• 0 citations
OpenAlex

Abstract

As the need for data secrets develops, so are systems that should make this secrecy possible. Today, most commonly used are classic cryptographic systems and cryptographic public key systems. Thanks totheintensedevelopmentofquantummechanics,inthelast30yearsawholenewkindofcryptography has emerged: quantum cryptography. Her biggest contribution is the ability to detect the interception of a communication channel by a third person. Is this really like that? The question is, if quantum cryptography is that good, why is it not widespread? The meaning of this paper is, on the one hand, define the basic mechanisms of quantum cryptography and protocols, and, on the other hand, point to the disadvantages of those relating to the possibilities of today’s circuitry and the security shortcomings in the protocols.

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As the need for data secrets develops, so are systems that should make this secrecy possible. Today, most commonly used are classic cryptographic systems and cryptographic public key systems. Thanks totheintensedevelopmentofquantummechanics,inthelast30yearsawholenewkindofcryptography has emerged: quantum cryptography. Her biggest contribution is the ability to detect the interception of a communication channel by a third person. Is this really like that? The question is, if quantum cryptography is that good, why is it not widespread? The meaning of this paper is, on the one hand, define the basic mechanisms of quantum cryptography and protocols, and, on the other hand, point to the disadvantages of those relating to the possibilities of today’s circuitry and the security shortcomings in the protocols.
Along with the development of confidentiality of data and resources, there is a need to develop systems that would provide confidentiality. Currently, the most used systems are classical cryptographic systems and encryption public key systems. However, none of these systems provides a solution for the famous 'catch 22' of cryptography. Owing to the intensive development of quantum mechanics, in the last 30 years emerged an entirely new kind of cryptography-quantum cryptography. Its greatest contribution is a possibility to discover an intercepted communication channel from a third party. The question is: is this really true? The question arises: 'If the quantum cryptography is so good, why is not widely used?' The aim of this paper is, on the one hand, to define the basic mechanisms of quantum cryptography IP, and, on the other hand, to point to the shortcomings, as they related to the opportunities of today's devices and flaws in protocols.
Due to the growing need for dana protection, especially nowadays when the Internet is everywhere, systems are being developed that can enable this secrecy. Nowadays, the most commonly used are classic cryptographic systems and cryptographic systems that have a public key. Unfortunately, no cryptographic system can solve a known problem called „handle 22“. Thanks to the great rise of technology, its development has led to a completely new type of cryptography, quantum cryptography. With the help of quantum cryptography, we can more easily detect if someone is eavesdropping on a communication channel. However, although quantum cryptography is considered very secure, it is not always so, but if it is more secure than classical why it is not used more often? The aim of this paper is to explain the basic possibilities of quantum cryptography and its protocols, but also to point out its shortcomings.
Quantum cryptography aims at solving the everlasting problem of unconditional security in private communication. Every time we send personal information over a telecom channel a sophisticate algorithm protect our privacy making our data unintelligible to unauthorized receivers. These protocols resulted from the long history of cryptography. The security of modern cryptographic systems is guaranteed by complexity: the computational power that would be needed for gaining info on the code key largely exceed available one. Security of actual crypto systems is not “by principle” but “practical”. On the contrary, quantum technology promises to make possible to realize provably secure protocols. Quantum cryptology exploits paradigmatic aspects of quantum mechanics, like superposition principle and uncertainty relations. In this contribution, after a brief historical introduction, we aim at giving a survey on the physical principles underlying the quantum approach to cryptography. Then, we analyze a possible continuous variable protocol.
In the era of information technology the need for secure communication has become increasingly important. Cryptography is a technology for creating the core of information security we use cryptography for making data secure which is the science of information protection from unauthorized interception and tempering. Most modern cryptographic studies design cryptosystems and algorithms using mathematical concepts which are based either on factorization or on discrete logarithm problem. In recent years quantum information research has lead to the discovery of a number of remarkable new paradigms for information processing and communication. These developments include quantum cryptography schemes that offer unconditionally secure information transport guaranteed by quantum-mechanical laws, which provide protection of system security, and optimization of system efficiency and detects intrusion and wiretap. Today quantum cryptography is used in various application for transferring secure data without the fear of keys being compromised. This paper reviews the various areas where quantum  cryptography is successfully implemented, its advantages disadvantages & technical issues.
Broadly speaking, cryptography is the problem of doing communication or computation involving two or more parties who may not trust one another. The best known cryptographic problem is the transmission of secret messages. Suppose wish to communicate in secret. For example, you may wish to give your credit card number to a merchant in exchange for goods, hopefully without any malevolent third party intercepting your credit card number. The way this is done is to use a cryptographic protocol. The most important distinction is between private key cryptosystems and public key cryptosystems.
Quantum Cryptography is a novel approach to make the information and network world more secure. Unlike classical cryptography, quantum cryptography ensures the security of communication because it is based on the laws of Quantum Mechanics; a branch of physics that deals with the fundamental behavior of matter and their energies to the levels of subatomic particles. These particles and their intrinsic properties such as photon polarization and entanglement allow us to develop an unbreakable system of cryptographic information. Conventionally, the security has been primarily concerned with the secured distribution of secret key carried over an insecure channel. However, in Quantum Cryptographic systems the transmission of secret key is done using aforementioned laws of nature through a secured quantum channel highly susceptible to intrusion detection. Consequently, the Quantum Key Distribution (QKD), in conjunction with protocols such as BB84 protocol has emerged as an ultimate modern secured communication system. This article concentrates on briefly reviewing quantum cryptography, some recent developments and reports of its vulnerabilities.